Pressing is used to form and densify the ceramic by compressing it in the form of a paste in mould in the shape of the item to be manufactured.
There are three types of pressing:
Uniaxial pressing (forging): Forging operation that involves plastic deformation using matrices after raising the temperature of the parts (pressure = 2,300 kN).
Dry bag isostatic pressing: Radial pressing through a flexible membrane (pressure = 2,000 bars).
Wet bag isostatic pressing: Multidirectional pressing through a flexible membrane (pressure = 3,100 bars).
Very high purity alumina
Controlled porosity ceramics
Advantages and disadvantages of this process
- High output (forging, dry bag)
- Simply forming
- Low output (wet bag)